<!DOCTYPE html>
<html lang="zh-cn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title></title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>

<body>

    <canvas id=q>

        <script>
            const s = window.screen;
            const w = (q.width = s.width);
            const h = (q.height = s.height);
            const ctx = q.getContext("2d");

            const p = Array(Math.floor(w / 10) + 1).fill(0);

            const random = (items) => items[Math.floor(Math.random() * items.length)];

            const hex = "0123456789ABCDEF".split("");

            setInterval(() => {
              ctx.fillStyle = "rgba(0,0,0,.05)";
              ctx.fillRect(0, 0, w, h);
              ctx.fillStyle = "#0f0";
              p.map((v, i) => {
                ctx.fillText(random(hex), i * 10, v);
                p[i] = v >= h || v > 50 + 10000 * Math.random() ? 0 : v + 10;
              });
            }, 1000 / 30);
        </script>
</body>

</html>